Trinity Seven

Arata Kasuga's town was destroyed by the "Breakdown Phenomenon," resulting from the red sun's disappearance. Utilizing a magical grimoire from his childhood friend and cousin Hijiri, Arata's world was artificially rebuilt. However, this reconstruction was short-lived, as Lilith Asami appeared, prompting Arata to choose between handing over the book or dying. Instead, Arata opted to attend Royal Biblia Academy, a top-secret magic school, where he joined six other magical users, forming the Trinity Seven with Lilith.